Santa Cruz County Sheriff's Deputy Ryan Kennedy said investigators identified a suspect, arrested him in Santa Cruz, and took him into custody at juvenile hall. The teen is facing one charge of felony battery with great bodily injury.

His name was not released because he is a minor, and Kennedy declined to say where the suspect goes to school.

On Saturday night, an Aptos house party spiraled out of control when more than a hundred teenagers showed up and violence broke out, witnesses told KSBW.

An 18-year-old Aptos High School student, Drake Goldsmith, hosted the party at his parents' large house on Skyward Drive off Trout Gulch Road while his parents were out of town.

Party guests were mostly Soquel, Harbor and Aptos high school students, and Goldsmith said way more teens showed up than he intended and crashed the party.

"People just kept coming, more and more," Goldsmith told KSBW reporter Felix Cortez on Monday. "Like, it was ridiculous. There was not supposed to be that many people."

When Cortez asked Goldsmith if there was underage drinking at the party, the Aptos High senior shrugged and said, "Well, it's a party. So... I'm not going to say."

On Saturday, neighbors called 911 to report a loud party. Deputies showed up at 9 p.m., issued a warning, and some teens began to leave, Kennedy said. But neighbors said as soon as deputies left, the party raged on.

At 11 p.m., neighbor Michael Mora, 71, went to the house and told the teenagers that they had to move their cars because they were blocking his driveway.

While he was reasoning with several teens, one of the teenagers viciously attacked the elderly man while he was standing on the house's long driveway and shoved him down a hill, the victim's wife said.

A second partier ran to the victim's house to alert his wife about the attack.

"My husband was nearly killed. That young man nearly took my husband's life. He attacked him from behind, pummeled him, threw him over the side of a hill, and kept beating him," Shauna Mora said.

Michael Mora was found with a bloody face and broken glasses. He lost consciousness as an ambulance rushed him to the hospital. Doctors discovered that his brain was bleeding and swelling, and he underwent emergency brain surgery. He was listed in serious but stable condition in Dominican Hospital's intensive care unit.

Residents said they were "horrified" by the attack and were concerned that law enforcement failed to control the party down before someone was hurt.

"I'm really, really disappointed in the sheriff's response to this," neighbor Dan Garcia said. "I'd like to understand why they did not do more."

On Monday Goldsmith said he was extremely sorry for the incident.

"I didn't mean that to happen at all. That's just stupid teenagers doing stupid s**t that they shouldn't be doing," Goldsmith said. "I send my regards to the family."

Investigators said Goldsmith will not face any charges and they believe Saturday's violence was an isolated incident.

PHOTOS: Who's who in the Aptos teen house party case

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KSBW

On Saturday night, an Aptos house party on Skyward Drive spiraled out of control when more than a hundred teenagers showed up.